The parade was for the 12th anniversary of the terror group.
Even the PRC website doesn't have all photos.
Since no one can march in Gaza without Hamas permission, and no one can import weapons without Hamas permission, the only conclusion is that Hamas has outsourced some of it terror activities to the PRC and other groups like Islamic Jihad which likewise have similar parades.
This way Hamas can try to portray itself as moderate and pragmatic when they publish op-eds in the New York Times and when they present themselves as the legitimate leaders of "Palestine" to Arab nations, but it can ensure that when it decides that rockets should be fired on Jews, rockets will be fired.